·To enable further work to be carried out on the hydration of hemihydrate plasters materials purer than the available commercial plasters and with reproducible properties were required As a first stage in the attempted preparation of such materials the process variables in the autoclave dehydration of gypsum were investigated Methods of treating the gypsum to
An improved "lump" process for producing alpha gypsum calcium sulfate hemihydrate from natural gypsum rock of the type wherein lumps of gypsum rock particles a minimum of about 1/2 inch or cm in size are calcined to low water demand alpha hemihydrate by autoclaving in a saturated steam atmosphere quickly dried and pulverized is disclosed
process at around 100 C in an autoclave filled with gypsum slurry In this process larger In this process larger hemihydrate crystals can grow with fewer surface defects
range of application Hitherto the preparation methods of α HH from industrial by product gypsum mainly include the autoclave process salt/acid solution process or alcohol water solution process Thereinto the autoclave process is the only method to
Another way is a recrystallization process at around 100 C in an autoclave filled with gypsum slurry In this process larger hemihydrate crystals can grow with fewer surface defects The formed product is called alpha hemihydrate This alpha hemihydrate process can also happen inside of a dehydrating gypsum crystal like described by
Under optimal working conditions the quality of the formed α hemihydrate gypsum is similar to that of a material produced in an autoclave References 1 E Eipeltauer Preparation of Crude Gipseous Rock and Its Conversion into Its Various Hemihydrate Plaster Forms in Ger Zem Kalk Gips 11 264 304 1958
Under optimal working conditions the quality of the formed α hemihydrate gypsum is similar to that of a material produced in an autoclave References 1 E Eipeltauer Preparation of Crude Gipseous Rock and Its Conversion into Its Various Hemihydrate Plaster Forms in Ger Zem Kalk Gips 11 264 304 1958
·Using solar energy to dehydrate gypsum to produce β hemihydrate is one way to improve the carbon footprint 13 14 Alternatively α hemihydrate is produced from gypsum using an autoclave process
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